Air-controlling mechanism for glass-blowing machines.



A. KADOW.

AIR CONTROLLING MECHANISM FOR GLASS BLOWING MACHINES.

APPLICATION FILED SEP T- I I, I9I2 Patented Feb. 5,1918.

A. KA DOW. AIR CONTROLLING MECHANISM FOR GLASS BLOWING IACHINES.

APPLJCATIOI FILED SEPT. 1|. "l2.

- mama Feb. 5

19m 0 IIIIETHIIIET I A. KADOW.'

AIR CONTROLLING MECHANISM FOR cuss BLOWING MACHINES.

APPLICATION msosnnn. |s|2.

, l0 SHEETS-6N! 3. Q

, Patented Feb. 5,1918.- 7

v A. KADOW. AIR CONTROLLING MECHANISM FOR GLASS BLOWING'MAGHINES.

APPLICATION FILED SEPI- l l. I912. 1,255,317. I I Patented Feb. 5,1918.

' 1o sun's-4am 4.

AIII CONTROLLING MECHANISM FOR GLASS BLOWING MACIIIIIES. APPLICATIONFILED SEPT. 1 I. 1912- 1,255,317. I Patented raw, 1918.

I0 "ENS-SHEET fla? m1 A. KAD'OW: MR CONTBOLUNG MECHANISM FOR GLASSBLOWING IACI'IINES APPLICATION mm mm. 191:.

} 1,255,317. Patented Feh.5,1918.

I0 SIIIETHOIEEI I A. IIADOW.. MII CONTROLLING MECHANISM FOR GLASSBLOWING MACHINES,

I APPLIGATIOII I'll-ED PT. I I. I912.

1,255,317. Patented Feb. 5,1918

I0 SHEE-THHEET 8- A. KAD'OWQ I AIH Coumoumc MECHANISM FOR GLASS BLOWINGMACHINES.

APPLICATION FILED SEPT. II. 1912.

Patented Feb. 5

1D SHEETS-SHEET l0.

AUGUST KAnow, or

TOLEDO, OHIO, ASSIGNOR TO THE WESTLAKE MACHINE COMPANY,

OF TOLEDO, OHIO, A CORPORATION OF OHIO.

AIR-CONTROLLING MECHANISM FOR GLASSJBLOWING MACHINES.

Specification of Letters Patent.

Patented Feb. 5,1918.

Application filed September 11, 1912; Serial No. 719,865.

'1 '0 all who/2i it may concern:

Be it known that I, Aucns'r Kaoow, a citizen of the United States,residing at Toledo, in the county of Lucas and State of Ohio, haveinvented'certain new and useful Improvements in Air-ControllingMechanism for Glass-Blowing Machines, of which the following is aspecification.

My invention relates to automatic glass blowing machinery and its objectis to provide improved mechanism for controlling the compressed air usedin the operation of blowing the glass.

Viewed more specifically, the invention has for its object certa inimprovements in the air controlling mechanisms forming a part of theglass working. machine disclosed in my copending application filed July6., 1910, Serial No. 570,621,. and in my application Serial No. 628,225,filed May 19,1911, (patented Aug. 22, 1916, as Patent No. 1,195,588,)which is a division of the aforementioned application coveringparticularly the air controlling mechanisms disclosed but not, claimedin the parent case. While the immediate objcctof the prcsentinvention isto provide certain improvements upon the machine referred to and theinvention will be described in the following specification in itsapplication to said machine, the air control system which I have devisedand seek to cover here-in might be utilized in glass blowing machineryquite different in general organization from the machine of my priorapplications.

The compressed air control system of the machine of application SerialNo. 570,621 showed that it possessed certaindefects in operation whichwould have'to becured if the best results were to beobtained under allconditions of use. The machine provided for the introduction ofcompressed air into the blank, at certain stages of the manufac ture, inpuifsor measured bodies. The old machine was not-capable of measuringthe pressure, volume and duration of these pufi's with the accuraoyrequired by practical con ditions. The air-pressure employed for theseoperations is relatively high. It may be as high as eight or ten poundsper square inch, although a pressure as high as this is not alwaysnecessary or desirable. Themachine also employs compressed air at arelatively low pressu1*e,'say from four to eight ounces per square inch.This pressure is used in the final development'of the blank in thefinishing mold. With reference to the low pressure air, my presentinvention provides an arrangement for applying this pressure to theblank gradually, ashas been found necessary in order to prevent theblank from binding against the mold and becoming distorted as it isrevolved in the mold. The character and quality of the glass operatedupon inevitably varies. Sometimes it will be softer at the moment it issubjected to the air pressure than at others. If the pressureof the bodyof air introduced into'the blank is in excess of that required by thecondition of the glass, the blank will be expand-ed too much,ordistorted. On the other hand, if the pressure is less than that requiredthe blankwill not be sufficiently expanded. In a complicated machine ofconsiderable size consisting of a number of parts, some of which haverelative movement'with respect to each other, it is impossible underpractical working conditions to maintain a given pressure at or near theplace where the compressed air is used by maintaining the, air in thesupply tank at a constant pressure. The leakage wh1ch is sure to takeplace, particularlyin a machine consisting of a number of working unitslike the machine referred to, cannot be calculated accu'ratelylMoreover, a bad leak in' one unit will throw the air system for theentire machine out of adjustment.

The air control system of my machine as originally constructed, whileoperating successfully under certaln conditions, was not susceptible ofthe extreme nicety of adjustment required by the character of thematerial operated upon-molten' or semi-congealed glass; furthermore,such adjustment as was possible to obtain could only be obtained withdifiiculty. Ordinarily, to readjust the machine fora difierent qualityof glass it was necessary to-stop-it and take the valves apart. Mypresent invention provides a compressed air controlling'apparatus inwhich the pressures and volumes of air delivered to the blank may bedetermined with the'utmost accuracy. Furthermore, this adjustment may bemade for each workin unit of the machine and may be made while themachine is in operation. This is important because it thereby becomespossible to obtain an adjustment which is exactly required by thecondition of the glass operated upon at the time and to vary thatadjustment as conditions vary.

A further objection to the air control system of my original machine wasthat the valves did. not always seat with perfect accuracy nor move withthe certainty and quickness required. The present invention provides anovel form of air controlling valve and a novel mechanism for operatingthe same which exactly meets the peculiar requirements of machinery ofthis sort.

The invention consists further in the novel and improved mechanisms,combina tions and the devices relating to glass blowing machinery whichare shown in the ac companying drawings and will be hereinafterdescribed and claimed.

The invention is illustrated in certain preferred embodiments in theaccompanying drawings, wherein Figure-1 is a fragmentary, sectional planof a glass blowing machine constructed in accordance with my invention;

' Fig. 2, a radial, sectional view taken on line 2-2 of Fig. 1,.lookingin the direction of the arrows;

Fig. 3, a plan view of the compressed air controlling mechanism, aportion of which is shown in the preceding figures;

Fig. 4, a sectional view taken on line 4 1 of Fig. 3, looking in thedirection of the arrows;

Fig. 5, a cross-sectional view taken on line .5-5 of Fig. 4, looking inthe direction of the arrows;

Fig. 6, an elevation of the outer end of the apparatus with certainparts broken away;

Fig. 7, a sectional plan on line 7-7 of' Fig 6; v ig. 8, a sectionalview on line 88 of Fig. 7, looking in the direction of the arrows F igs-9 and 10, similar views taken' on lines 99 and 10-10 of Fig. 3, lookingin the direction of the arrows in each case;

Fig. 11, aside-elevation of the casting supporting the controllingvalves with said valves and their casings removed;

-Fig. 12, a fragmentary plan view of a modified construction in whichthe valves corresponding to the plunger operated reciprocating valves ofthe other construction are rotary valves instead of the reciprocating 7ype;

Fig. 13, an end elevation of the same; Figs. 14- and 15, sectional viewstaken on lines 14-14 and 15-45, respectively, of Fig. 12;

Fig. 16,a view showing'in elevation the air controlling mechanism of thepresent invention, together with the spindle or .b1owpipe, and m sectioncertain associated portions of the glass forming machine; and

ports several glass forming units.

units. Each unit consists of a blowpipe or spindle, as it has beentermed because of its capacity for axial rotation, and certain otherdevices for producing the blown glass article. The article which themachine in question is particularly designed to produce is a common,pear-shaped electric light bulb.

It will be sufiicient to state, for the'understanding of the presentinvention, that each glass working unit is provided with a device which,at a certain point in the. rotation of the machine around the stationarydrum, enters the working opening of the glass furnace, withdraws acharge ofglass and secures it to the end of the blowpipe or spindle. Theblowpipe at this time is in a vertical position with its open endupward. The blank is developed by certain movements of the blow-pipeaccompanied by the introduction of high pressure air tliereinto in theform of puffs. The blank is completed while being inclosed in thefinishing mold. Itis rotated in the mold by revolving the-blowpipe onits longitudinal axis. During this operation low pressure air isintroduced into the blank in the manner to be hereinafter described.

General description of apparatus. Referring how to the preferred form ofapparatus shown in Figs. 1 to 11, inclusive-,

1 framework of the machine formed with air chambers 29 and 30communicating with the chambers 26, 27, respectively.- The structure 28,only a part of which is shown, sup- Each unit comprises a mechanism forcontrolling the compressed air supplied to the blowpipe of said unit;these .I'nechanisms constituting the subject-matter of my presentinvention.

These mechanisms are all alike for the different units and, therefore,but a single one will be described. It should be understood, however,that the arrangement and constructions of valves which I have devised isof particular utility when used for providing separate controlling meansfor the several units of a machine of the sort referred to because anair control system of this sort permits an accurate adjustment for eachunit to take care of the leakages of the particular units which may varyas between the different units.

Secured to the under side of the annular structure 28 adjacent to theother elements of each glass unit is a casting 31 preferably formed witharms or wings 32, 32 (Fig. 3) Which are bolted to the uprights 33forming a part of the rotating framework of the machine. The casting 31has a high pressure port 34 communicating with the port 35 leading fromthe chamber 29 and with a low pressure port 36 communicating by port 30(Fig. 16) with the low pressure chamber 30. The admission of the lowpressure air to the blowpipe is governed by a valve designated as awhole b the letter A (see particularly Fig. 4).. This valve'isperiodically unseated by a plunger designated A. which meets certaincams A on the periphery of the stationary drum 25 (Fig. 2). Theadmission of'high pressure air to the s indle is governed by two valvesB and operated by similar plungers B, C, actuated by cams B, C. Ddesignates a relief .valve by which the air system and the blank are putinto communication with the atmosphere in order to relieve the pressure.This valve is operated by a plunger D fromcams similar to those whichactuated the other plungers. The valves A, B,AC and D are secured to acasting 37 which is attached to casting 31 by the bolts 38." Theblowpipe or spindle is designated. E (Fig. 16 and is supported on therotating) frame y certain devices which need not: e described. Thefinishing mold (FigQ 17) is designated 'F and the finished bulb or blankis designated G.

The low pressure. 'controZZi/rtg mechanism.

indicate the course of the low pressure air.

The course of the high ressure air will be indicated by unfeatherearrows. The duct v39 leadsto a port 40 of relatively smallcross-sectional area formed in a bushing 41. Into the 'other'end of thisport extends a needle. valve 42 '(Fig. 7), the stem 43 of which has athreaded engagement with a ring 44 seated in a cavity 45 formed in thecasting 37. The stem of the needle valve passes through a stufling box46 and is .pro-

the valve casing at this point. lower, it will'be seen, normally standsout vided at its outer end with the knurled head 47. The purpose of theneedle valve is to retard the flow of air through the duct leading tothe blow-pipe when the valve 60. to be hereafter described, is opened.The needle valve is intended to stand open, in the operation of themachine, so as to restrict the low pressure vair duct, thereby makingthe application of the low ressure air against the glass while in thenishing mold gradual instead of sudden. The sudden application, even ofa low pressure of air, will produce a distortion of the blank because ofthe tendency of the blank to bind in the mold instead of rotatingtherein freely. The air entering the chamber 45 past the needle valvepasses through the port 48 into a port 49 formed in the casing 50 of thevalve A. The valve casing is formed with a beveled valve seat 51 andwith an outlet port 52 communicating with a duct 53 in the casting 37.Within the casing is a valve stem 54 one end of which 55 is guided in abore 56 formed in the bonnet 56, the other end 57 being formed with anenlargement 58 fitting into a gland 59. A ball valve of the Fuller balltype 60 of rubber or other resilient material is secured on the stem 54.Preferably, the center portion of the stem is threaded as indicated at61 and the end 57 given a larger diameter so that a shoulder is providedagainst which the valve is pressed by means of the nut 62. A spring 63is interposed between the nut 62' and the bonnet 56 and tends to keepthe. valve seated. Any wear may be taken up by an adjustment of the nut62. I The valve casing 50 is formed on the end with a boss 64 threadedto receive the cap 65. A follower rod 66 extends through the end of thecap and into the gland 59. The inner end of the rod 'is'provided with acollar 67 and the outer end with a disk 68, a spiral spring 69 beinginterposed between the disk and a boss 70 formed on the cap. Thefollower is packed by the packing 71, preferably held in place by thering 72 aglainst which bears the spiral spring 73 he collar 67 serves tohold the fol lowen in place against-' the tension ofspring'69 and at thesame time provides a valve to prevent the escape of air from The folofcontact with the stem of valve 60. The follower is made separate fromand spaced away from the stern of valve 60 for several reasons. .In thefirst place, it makes the valve 60 more sensitive and allows it to seatmore accurately as its stem is not affected- "follower the packing wouldbe likely to throw the valve stem out of alinement so that the valvewould not. operate reliably. Furthermore, by making these two elementsseparate the collar 67 on the end of the follower, by seating againstthe inside of the casing 50, acts as a valve to prevent the escape ofairthrough the gland through which the follower passes. The follower ismoved against the stem of the valve "to open said valve by means of theplunger A. The plunger (Fig. 4) is guided in suitable guides formed inthe castings 31, 39 and is provided with a collar 74 against which bearsa spiral spring 75. The outer end of the plunger is formed with a roller76 adapted to engage the cam on the stationary drum of the machine.Preferably, the plunger is formed with a slot 77 (Figs; 3 and 4) intowhich projects a stop pin 78. When the roller 76 meets one of the cams Athe plunger is forced baelr into contact with the follower 66 and forcesthe same against the stem 51 of valve 60 opening the valve. Compressedair passes from the gland 59, through the valve chamber and port 52. andthence through the connecting ducts 79 and 80 formed in thecasting 37,to a duct 81 communicating with a pipe, preferably the rubber hose82(Figs. 3 and 11), by which the air is conducted to the spindle E.

Controlling mechanisms for high pressure cm.

- 90 designates a rubber diaphragm secured between .the castings 87, 88and 91, a metal plate on the under side of said diaphragm which-restsupon the knob 92 formed on the arm 93 pivoted to a fork94 formed on thecasting 88, the arm extending through an opening 95 in said lastmentioned casting.

A spiral spring 96 seated on the end of a threaded stem 97 bears againstthe arm'93. The stem 97 engages a threaded portion of the tubular member98. constituting the lower part of the castin 88, the stem being formedwith the knurle head 99. A plug 100 is set into the casting 87 and isformed with a bore 101 which communicates, by means of the ports 102with a duct 103 in the casting which duct communicates by means of theports 104, 105 with the high pressure airwduct 83 in the casting 87. Thelower part of thepluglOO is formed with ports 106 communicatlngwith thespace or diaphragm chamber 107 between t e diaphragm 90 and the casting87. Fitted within the bore 101 of the plug 100 is a. valve stem 108. Arubber ball valve 109 s secured on the threaded end of the stem 108 bymeans of the nut 110. A spiral spring 111 intervenes between the underface of theplug 100 and a boss 112 on the valve stem 108. Leading fromthe diaphragm chamber 107 through the casting 87 is a duet 113communicating by norts 114, 115, with a duct 116 formed in the casting37. The air in the duct 116 passes through the valves B and C, whenthese valves are opened, in the manner to be described presently, andthence through the ducts 80, 81. to the spindle. The function of theregulator is to automatically regulate the pressure of air delivered tothis.

end of the system, regardless of the ressure that may prevail inthesource of supp y and in the various air passages leading to the valve109. The air from the duct 103 passes the valve 109, assuming that thevalve is unseatcd,and flowsthrough the diaphragm chamber 107 and outthrough the duct 113. So long as the pressure on the low pressure sideof the valve 109 is less than the pressure desired, valve 109 remainsopen. As soon'as the desiredpressure is reached the diaphragm is forceddown and this permits the spring 111 to seat the valve. The pressurethus produced in the part of the system beyond the regulator may bevaried by turning the adjusting stem'97.

The valve B may be identical in its construction with the valve A,described above in connection with the description of the low pressuresystem. The air from duct 116 enters the valve B through a port 117formed in the casting 37 (Fig 11) which port communicates with a port inthe-casing of valve B corresponding tothe port 49 of valve A (see Fig.7). The air after going throu h the casingof valve B, assuming that t evalve. be opened, passes out through a port in the casing of valve Bcorresponding to the port 52 of valve A. This port leads to ,a port 118communicating with a.

diagonally extending duct 119 which leads to a duct 120 registering withthe inlet port of valve C, namely the port corresponding to the port 49of valve A. The duct 120 extends through the casting 37 from the duct119 in the, direction opposite to the valve C and communicates with apipe 121 support-' ing an air reservoir 122, as best, shown in Fig. 6.Therefore, with the valve B open and the valve C closed, the airreservoir 122 will be filled with a body of compressed air the volume ofwhich is or course determined by the volumetric contents of thereservoir and associated air passages and the pressure of which will beadjustably fixed by the regulating apparatus abhye described. The

outlet port of the valve Gthe port corresponding to port 52 of valveAregisters with a duct 123 in the casting 37 which is in effect acontinuation of the duct 80 through which the low pressure air passes toport 81 and the blow pipe. Therefore, when the valve B is closed and thevalve C is opened, the body of air in the reservoir, and connectingpassages, is discharged throu h the pipe into the body of glass thereon.T 1e air is introduced into the blank in the form of a puff which,because it has a definite volume and a definite pressure, (for ablank ofany given resistance) exerts a definite amount of expansive force withinthe blank, the duration of which is fixed. The amount of this force andits duration can be varied to compensate for a variation in thecharacter of the glass by varying the pressure in the reservoir by aproper adjustment of the air regulating device above described.

If both valves B and C are held open simultaneously, which result may beobtained by a proper arrangement of the cams for actuatmg the pistons B,C, air at high pressure, but at a determinable pressure fixed by theadjustment of the regulator, will enter the blank in a continuousstream. Ina machine such as that shown in my copending application N 0.570,621, the-air is introduced in uifs while the blank is being expandedand 1s introduced in a continuous stream when the blank is confined inthe mold.

The relief valve.

cessive puff of air has been introduced into the'blank. This causes theblank to momen' tarily collapse, an operation. which facilitates themaking of the article, for reasons whichneed not be stated.

Leading from the duct 80 is a downwardly extending duct 12 1' (Figs. 6,Sand 11), the lower end of which is closed by the plug 125. From duct124 a duct 126 leads to'a duct 127 which latter, duct registers with aport in the casing of'valve D corresponding to the port 56 of valve A.The discharge port of valve D, corresponding with the inlet ort 49 ofvalve A, registers with a duet 128 1n-the'castin 37, this duet leadin'to a duct'129 whic latter extends to the ottom of the casting. The'valve D isopened by means of its plunger D whenthe latter meets asuitably placed cam on the drum 25. As the duct 124 communicates withthe duct 81 which leads to thehlowpipe, the

pressure in the blowpipe, and in the blank, is relieved as soon as valveD is opened, the air passing out through the casing ot'valve l) in thedirection opposite to that of the flow ot' the air through the othervalves.

In Figs. 12 to 15. inclusive, a modification is shown in which thevalves, instead of being reciprocating valves. are rotated to open andclose the portswhich they control. The arrangement of plungers and earnsis intended to be exactly the same as in the construction shown in thefirst 11 figures. The system of air passages and the general arrangementof the valves is alsothe same. In the modification the valves designateda, b, c and d, respectively, are conical valves,

each being seated in a conical seat formed in the casting 130. Eachvalve is formed with a port 131. The ports of valves a, b and arearranged to register with the air duct 132. The port of valve (Z isadapted to register with the relief port 133. 134 designates a ductleading from the needle valve 135 to the upper end of duct 132. 136designates a duct through which the air is admitted to the blowpipe. Aduct 137 leads from the duct 132 to the relief port 133. Theconstruction of the four valve mechanisms is identical'so that but oneneeds to be described/ Thevalve is pressed to its seat by aspiral-spring 138, the spring intervening between the valve and aconically pointed block 139 which bears against the bonnet 1 10. Thevalve is provided with a stem l ll rotatably mounted in .the casting 142and carrying on the end a-seetor'gcar 143 which is meshed by the teethof 'a rack 144 formed on the plunger 115. The plunger is slidablymounted in a cylindrical openmg 146 formed in the casting 1 12 in linewith one of the camopera-ted plungers A, B, etc. A spring 147 isinterposed between a shoulder 148"formed on the casting and the head 149of the plun er 145.. When one of: the cam'operated p unger rods A, B,etc., is forced inwardly by engagement with a cam on the stationarydrum, it is thrust against the corresponding plunger ,145. Themovement'of the plunger 145 rocks the valve,a, b, c or d, as the casemay be, so

that the port in said valve is alined with theduct which said'valvecontrols.

While I have shown and described my invention as embodied in certainpreferred constructions, it will be readily understood thatmodifications might be made without departingfrom the rinciples of theinvention. Therefore, I 0 not wish to be understood as limiting theinvention to these exact constructions, arrangements. and devices.

I claim:

1.- In air controlling mechanism for glass blowing'machines, thecombination with a valve, of a movable actuating device forintermittently opening said valve, a packed bearing and a spring pressedelement mounted in the bearing and interposed between said actuatingdevice and said valve which is normally free from both the valve and theactuating device.

2. In air controlling mechanism for glass blowing machines,thecombination with a spring-pressed valve, of a plunger operating tounseat the valve, a packed bearin ,and a spring-pressed element mountedin t 1e bearing and interposed between the valve and the plunger whichis normally free from both valve and plunger.

3. In air controlling mechanism for glass blowing machines, thecombination with a valve, of a movable actuating device forintermittently opening said valve, a packed bearing, and a transmittingelement mounted in the bearing and interposed between said actuatingdevice and valve which normally stands out of contact with said valve.4. In air controlling mechanism for glass blowing-machines, thecombination with a spring-pressed valve, of a plunger operating tounseat the valve, a cam for actuating sai plunger, a packed bearing, andaspringressed element mounted in the bearing and lnterposed between theplunger and valve which normally stands out of contact with said valve.

. 5. In air controlling mechanism for glass blowing machines, thecombination with a Casing formed interiorly with a valve seat, a valveslidably mounted in said casing, a follower extending through saidcasing in position to unseat said valve, a spring which normally holdsthe follower out of contact with said valve, means for moving saidfollower against said valve, and a collar on the inner end of saidfollower which limits the outward movement of the follower.

6. In air controllin mechanism for glass blowing machines, tiecombination with a casing formed interiorly with a 1 seat, a valve stemslidably mountedin said casing,

a rubberba-ll valve on said stem, a stuiiing box at the end of saidcasing, a followerrod extendin through said stufiingbox in line with saivalve stem but normally out of contact therewith, a plunger normally outof contact with said follower rod and a cam which moves the plungeragainst said follower rod.

7. In glass blowing apparatus, the combination with cooperating machineelements havingrelative movement with respect to each other, one ofwhich is adapted to support a blowpipe, said elements being formed witha system of communicating. passages providing a conduit through whichair passes from a su ply of compressed air to said blowpipe; o a valveto govern the admission of airto said blowpipemeans actuated by therelative movement etween said elements for opening and closing saidvalve; a needle valve, having an adjustable member, whereby it may bepositioned at various distances from its seat, arranged in said conduitin advance of said first-mentioned valve, a relief valve adapted to putsaid blowpipe in communication with the atmossr" V phere, and meansactuated b the relative movement between said mac ine elements I valve,and a needle valve which may e adjustably positioned to baflle or breakthe 'force of the air delivered. to the blowpipe when said admissionvalve is open.

9 In glassblowing apparatus, the combination with cooperating machineelements having relative movement with respect to each other, one-ofwhich is adapted to support ablowpipe, said elements being formed with asystem of communicating passages providing a con uit through which airpasses from a supply of compressed air to said blowpipe; 'of an airreservoir; a valve which governs the admission ofair to said reservoir;a valve which governs'the outflow of air from said reservoir to theblowpipe; means actuated by the relative movement between said elementsfor opening and closing said valves in succession; and a regulatingdevice arranged in said system immediatel in advance of said admission-valve whici produces a definite pressure in said reservoir .when theadmission is opened.

. 10. In lass blowing apparatus, the combis nation with cooperatingmachine elements having relative movement with respect to each other,one of which is adapted to support a blowpipe, said elements beingformed with a system of communicating passages providing a conduitthrough which air passes from a supply of compressed air to saidblowpipe' of an air reservoir; a valve which governs the admission ofair to said reservoir, a valve which governs the outflow of air fromsaid reservoir -to the blowpipe; means actuated by the relative movementbetweensaid elements for opening and closing said valves in succession;and a regulating device arrangedm said system immediately in advance ofsaid admission valve which produces a definite pressure in saidreservoir when the admission is opened, said regulabination withcooperating machine elementswhich tor having an adjusting member whichcan be manipulated to adjust the regulator to produce varying pressures.

11. In lass blowing apparatus, the combination with cotiperating machineelements having relative movement with respect to each other, one ofwhich is adapted to support a blowpipe, said elements being formed witha system of communicating passages providing a conduit through which airpasses from a supply of compressed air to said blowpipe; of an airreservoir; a valve overns the admission of air to said reservoir; avalve which governs the outflow of air from said reservoir to theblowpipe; means actuated by the relative movement between said elementsfor opening and closin said valves in succession a regulatino' evicearranged in said system immediatly in advance of said admission valvewhich produces a definite pressure in said reservoir when the admissionis opened; and means operated at other relative positions of saidmachine elements for simultaneously opening both of said valves.

19/. In glass blowing apparatus, the comhaving relative movement withrespect to each other, one of which is adapted to support a blowpipe,said elements being formed with a system of communicating passagesforming a conduit through which air passes ball type adapted to bearagainst said seat, a spring to seat said valve, a separate 01 from asupply of compressed 'air' to said blowpipe; of a valve which governsthe ad:

mission of air to said blowpipe; means actuated by the relative movementbetween said elements for opening. and closing said valve; and aregulating device arranged in said system adjacent said admission valvewhich automatically produces a definite pressure in said blowpipe andspaces communicating therewith when said admission valve is open, saidregulating device having an adjusting member which can be manipulated toadjust said regulator to produce different pressures.

13. In glass-blowing apparatus, the combination with a blow-pipe, ofair-controlling mechanism for the same comprising a v'alve' casingprovided with air-inlet and outlet ducts and formed with a seat, a valveof resilient material of the Fuller ball type movement to the followerin the direction of its length.

14. In glass blowing apparatus, the corn bination with a blow-pipe, ofair-controlling mechanism for the same comprising. a valve casingprovided with air-inlet and outlet ducts and formed with a conicalvalve-seat,

a valve of resilient material of the Fuller ball type having a roundedsurface adapted to bear against said seat, a stem on which said valve iscarried, means for guiding said stem, :1 spring to seat the valve, aseparate follower which extends into said valve casing adjacent to butout of contact with the end of the valve. stem, a packing for saidfollower, and means for moving the follower against the valve stem tounseat the valve.

15. In glass-blowing apparatus the combination with a blow-pipe, ofair-controlling mechanism for the same comprising a valvecasing providedwith air-inlet and outlet ducts and formed with a seat, a valve ofresilient material of the Fuller ball type adapted to bear against saidseat, a spring to seat said valve, a-follower capable of movementindependent of the valve which projects into said casing and is adaptedto unseat said valve, means for imparting movement to the follower inthe" direction of its length, and an adjustable needle-valve arranged insaid inlet duct to adjustably restrict-the effective cross-sectionalarea of the same so as to retard the flow of'air through i said duct.

16. In glass-blowing apparatus the combination with a blow-pipe, ofair-controlling mechanism for the same comprising. a valve casingprovided with air inlet and outlet ducts and .formed with a conical"valve-seat,

a valve of resilient material of the ,Fuller gagement with the casingfor the purpose of adjustment.

17. In glass-blowing apparatus, the combination with a revolubleblow-pipe and a finishing mold in which the blank is revolved and blown,of means providing a sourceof supply of low pressure air and a ductleading from the same to the blow-pipe,

a valve to close said duct, mechanism for opening said valve while theblankv is in the finishing mold, and an'adjustable valve in, said ductwhich is adapted in the operatiofi of the machine to stand partiallyopen to' retardinflow through said duct so thatfihe pressure is appliedto the blank gradually when the first-named valve is opened, 18,. Inglass-blowing apparatus, the combination with a revoluble blow-pipe anda finishing mold in which the blank is revolved and blown, of meansproviding a source of supply of low pressure air and a duct leading fromthe same to the blow-pipe, a porliun ni' \vhivh'is of I'LlllliYULY smallcrosssm'timinl arm. :1 valve of tho Fuller ball" l w In close fill Mlduct. mechanism for opening said vulvv while the blank is in the finihing mold nml u needle-valve which roim-t== illlu the restricted portionof said duct and is longitudinally adjustable so as to re- It is herebycertified that in Letters Patent No. l-,255,317, granted February 5,1918, upon the application of August Kadow, of Toledo, Ohio, for animprovement in "Air-Controlling Mechanism for Glass-Blowing Machines,"an error appears in the printed specification requiring correction asfollows: Page 5, line 56, for the reference-numeral 56 reani 52; andthat the said Letters Patent should be read with this correction thereinthat the same may conform to the record of the case in the PatentOffice.

Signed and scaled this 26th day of February, A. D., 1918.4

F. W. H. CLAY,

Acting C'ommiui ow of Patents.

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